Permethrin Dilution - Updated with Product PDFs

[casportpony]

I only have 8 hens. So how many teaspoons do I put in a quart of water to spray on each hen?

Go here:
What product do you have?

 

[cmom]

I only have 8 hens. So how many teaspoons do I put in a quart of water to spray on each hen?

If I were you I would buy the premixed.

 

[KaseySnow]

Does anyone know whether permethrin goes bad if not kept at the ideal temp? I bought some 36.8% concentrate and it has been sitting in a barn for a week. We have had pretty good temperatures at night all week, but last night it got down to the low 30s. I am worried that it is ruined, but can't find much about this online other than that the recommended storage temperature is 40-80 degrees F.

The most I've found is that it will get frozen chunks in it if it's cold, but nothing about whether or not that renders the substance ineffective.

 

[featherhead007]

I just drink it strait out of the bottle! I'm kidding.

 

[casportpony]

Does anyone know whether permethrin goes bad if not kept at the ideal temp? I bought some 36.8% concentrate and it has been sitting in a barn for a week. We have had pretty good temperatures at night all week, but last night it got down to the low 30s. I am worried that it is ruined, but can't find much about this online other than that the recommended storage temperature is 40-80 degrees F.

The most I've found is that it will get frozen chunks in it if it's cold, but nothing about whether or not that renders the substance ineffective.

I have experienced it going bad when left in direct sunlight. You're probably okay.

 

[feather16]

Permethrin comes in three different concentrations, 10% (most common, sold in most feed stores), 13.3% (common), and 36.8% (usually has to be ordered online). Below are tables that show how to make 1 gallon.

36.8% Solution needed per gallon
View attachment 2553639​

Ratio	Ounces	ML	Final %
1:19	1.7 ounces	50 ml	0.5%
1:39	0.85 ounces	25 ml	0.25%
1:99	0.425 ounces	12.6 ml	0.10%
1:199	0.21 ounces	6.2 ml	0.05%
1:399	0.11 ounces	3.125 ml	0.025%

---

13.3% Solution needed per gallon
View attachment 2553779​

Ratio	Ounces	ML	Final %
1:19	5.5 ounces	163 ml	0.5%
1:39	2.75 ounces	81 ml	0.25%
1:99	1.375 ounces	40.6 ml	0.10%
1:199	0.6875 ounces	20.3 ml	0.05%
1:399	0.34375 ounces	10.16 ml	0.025%

---

10.0% Solution needed per gallon
View attachment 2553820​

Ratio	Ounces	ML	Final %
1:19	6.4 ounces	190ml	0.5%
1:39	3.2 ounces	95 ml	0.25%
1:99	1.28 ounces	38 ml	0.10%
1:199	0.64 ounces	19 ml	0.05%
1:399	0.32 ounces	9.5 ml	0.025%

Sorry to be daft, trying to figure this out (I’ve got a quarter gallon sprayer to spritz the birds) for 0.25% I’ll need 3.2 oz AKA 95ml per gallon, right? Once I figure the tables out, I can divide for my quarter gallon sprayer. Thanks in advance!!

 

[casportpony]

Which permethrin do you have?

 

[feather16]

Whoops I copied all three, sorry. I have Permethrin 10

 

[casportpony]

Whoops I copied all three, sorry. I have Permethrin 10

Just dive the number by 4, that's what you need for a quart.

 

[springvalley123]

I only have 8 hens. So how many teaspoons do I put in a quart of water to spray on each hen?

Depends on which percentage. My Gordon's permethrin 10% says 1:200 for spraying on the chickens, so you have to open up the label to find the details for spraying on the chickens. It's NOT the same as spraying on a surface. Also the Gordon's says to use the mixture in 24 hours, so you can't just keep a mixture handy. hope this helps.